French phrase
Je ne sais pas où c'est.
Meaning
I don't know where it is.
When to use it
Says that the location of something is unknown. Common in everyday replies when asked for directions; more formal wording may be preferred in formal settings.
Example dialogue
Pardon, tu sais où est la gare ?
Excuse me, do you know where the station is?
Je ne sais pas où c'est.
I don't know where it is.